Php Array Undefined Index Error
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about php undefined index array key exists hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask php multidimensional array undefined index Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. php associative array undefined index Join them; it only takes a minute: Sign up PHP arrays and solution to 'undefined index' errors up vote 23 down vote favorite 4 I am working through some code done by a previous developer. I'm pretty new to
Php Array Undefined Offset
PHP so I am wondering if there is any well known pattern or solution to this problem. Basically the original author does not check any array indexes before he tries to use them. I know I can use isset() to check each before it is used, but right now there are hundreds of lines where these errors are appearing. Before I put on some music and start slamming my head into my keyboard I want to make sure php check for undefined index there is not some nice shortcut for handling this. Here is a typical section of code I'm looking at: /* snip */ "text" => $link . $top_pick_marker . $output['author'] . " " . " " . $output['new_icon'] . $output['rec_labels'] . " " . $output['admin_link'] . $output['alternate_title'] . $output['access_info'] . $output['description'] . $output['url'] . $output['subject_terms'] . $output['form_subdivisions'] . $output['dates_of_coverage'] . $output['update_frequency'] . $output['place_terms'], /* snip */ So I know I can use isset() here for each item. I would have to rearrange things a bit and remove all the concatenation as it is now. Is there any other easy way to do this or am I just stuck with it? php arrays share|improve this question asked Jul 28 '09 at 17:31 Alex Ciarlillo 5 +1 - This is actually a great question. In the "old days" of PHP, these E_NOTICE errors weren't thrown, and referencing uninitialized array indexes was very common. Obviously this is a bad habit, but it's easy to do with the loose typing of PHP. The E_NOTICES are a good tool to help tighten your code now. However, I find the sheer tedium of having to call isset() or empty() on all checks involving arrays quite mind-numbing. –zombat Jul 28 '09 at 18:10 add a comment| 10 Answers 10 active oldest votes up vote 20 down vote accepted Figure out what keys are in the $output array, and fill the missi
/ offset errors in PHP. What is an index?Firstly, you need to understand what an index is. When an element is added to an array, it is given an index (you can set this manually or PHP will php undefined index error automatically set one for you). This index acts as an identifier that allows you
Array_key_exists Php
to interact with the element in question. Without array indexes, you would be unable to keep track of which element is
Undefined Offset: 0
which.For example, in PHP, I can create an array like so:PHP 'Cat', 1 => 'Dog', 2 => 'Bird' );1234567 'Cat',1 => 'Dog',2 => 'Bird');As you can http://stackoverflow.com/questions/1195549/php-arrays-and-solution-to-undefined-index-errors see, Cat has the index "0" and Dog has the index "1". If I want to print the word "Cat" out onto the page, I will need to access the "Cat" element via its array index:PHP http://thisinterestsme.com/undefined-index-error-php/ want to print out the word "Dog", I can access it via the index "1":PHP
tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://wordpress.stackexchange.com/questions/235993/undefined-index-error-when-saving-empty-array-with-checkboxes/236023 about Stack Overflow the company Business Learn more about hiring developers or posting http://www.sitepoint.com/forums/showthread.php?486693-Best-way-to-avoid-NOTICE-Undefined-Index ads with us WordPress Development Questions Tags Users Badges Unanswered Ask Question _ WordPress Development Stack Exchange is a question and answer site for WordPress developers and administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up undefined index and rise to the top “Undefined index” error when saving empty array with checkboxes up vote 0 down vote favorite In my plugin settings page, I have a list of checkboxes that store the value into an array. While the it works as expected, whenever I uncheck all of the checkboxes and save those changes I get the following error: Notice: Undefined index: remove_field in ...\settings-profile.php on line 19 array undefined index Below is the code in question: if ( isset( $_POST['dsbl_options'] ) && !empty( $_POST['dsbl_options'] ) ) { update_option( 'dsbl_remove', $_POST['remove_field'] ); // (Line 19) } The rest of the source code can be found here: GitHub From doing research online for a similar error, I see that the recommendation is to wrap $_POST['remove_field'] with an isset. However, this does not store the values form the checkboxes in the plugin settings. As mentioned above, this error shows up only when all of the checkboxes are unchecked and saved. It looks like there is an issue when saving an empty value in the array. Although the plugin settings works as expected, I'd like to fix this. php plugin-development errors debug wp-debug share|improve this question edited Aug 16 at 0:12 asked Aug 15 at 15:08 Ethan Jinks O'Sullivan 2,5012629 Add a test for $_POST['remove_field'] to avoid trying to use it if it's empty. –jdm2112 Aug 15 at 15:16 May you please elaborate on what you mean by adding a test to $_POST['remove_field']? –Ethan Jinks O'Sullivan Aug 15 at 15:26 You are testing for a value (twice) in $_POST['dsbl_option'] but you are not testing if $_POST['remove_field'] has a value before you use i
to avoid NOTICE: Undefined Index?? The SitePoint Forums have moved. You can now find them here. This forum is now closed to new posts, but you can browse existing content. You can find out more information about the move and how to open a new account (if necessary) here. If you get stuck you can get support by emailing forums@sitepoint.com If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. SitePoint Sponsor User Tag List Results 1 to 22 of 22 Thread: Best way to avoid NOTICE: Undefined Index?? Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Jun 21, 2007,17:24 #1 dakine View Profile View Forum Posts SitePoint Enthusiast Join Date Dec 2006 Posts 82 Mentioned 0 Post(s) Tagged 0 Thread(s) Best way to avoid NOTICE: Undefined Index?? Currently when I check to see if a variable == true I get an notice level error if it isnt set which is frustrating the only way I can think of to easily fix this is to change my if statements from this PHP Code: if($value){ to this PHP Code:
//dosomething
}
if(isset($value)&&$value==true){
//dosomething
}